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Is it normal for a VDD pin of an RFIC to appears as ground when it is not yet mounted? It is checked using multimetre, and seems like the pin is shorted to ground pin.
Yes, if the final stage is a depletion mode MOSFET you'll see a short circuit (a low ohmic value) from D to S. This because in depletion mode devices the channel is already present when no electric field is applied. When the transistor is polarized, applying a negative voltage to gate the channel opens increasing the D to S resistance.
The enhancement mode MOSFET is exactly the opposite: the D to S channel normally doesn't exist and is formed when a Vgs voltage, higher than a given threshold is applied.
You can see the depletion mode as a normally closed switch and the enhancement mode as a normally open switch.
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